When you near the square at the end of the road you'll receive additional Marines by means of some Calldowns.

This point is critical since how well you play it will determine the number of Marines you will have left for the rest of the mission. A dialog will start as soon as you enter the area. Immediately, move your troops near the enemy Marines but not in firing range. Three drop pods will drop from the sky, carrying additional Marines. You want to order you troops to attack right before these land so that they are synchronized with the reinforcements, minimizing your losses.

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